21907640

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{47}}^1\times {\mathrm{271}}^1$

素因数の和:372

約数の個数: 64

約数和(自身を含む): 51701760

約数和(自身を除く): 29794120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 47, 86, 94, 172, 188, 215, 235, 271, 344, 376, 430, 470, 542, 860, 940, 1084, 1355, 1720, 1880, 2021, 2168, 2710, 4042, 5420, 8084, 10105, 10840, 11653, 12737, 16168, 20210, 23306, 25474, 40420, 46612, 50948, 58265, 63685, 80840, 93224, 101896, 116530, 127370, 233060, 254740, 466120, 509480, 547691, 1095382, 2190764, 2738455, 4381528, 5476910, 10953820, 21907640]

約数ペア:

[(1, 21907640), (2, 10953820), (4, 5476910), (5, 4381528), (8, 2738455), (10, 2190764), (20, 1095382), (40, 547691), (43, 509480), (47, 466120), (86, 254740), (94, 233060), (172, 127370), (188, 116530), (215, 101896), (235, 93224), (271, 80840), (344, 63685), (376, 58265), (430, 50948), (470, 46612), (542, 40420), (860, 25474), (940, 23306), (1084, 20210), (1355, 16168), (1720, 12737), (1880, 11653), (2021, 10840), (2168, 10105), (2710, 8084), (4042, 5420)]